Set the alarm clock for 8:21 pm

 

Leave this tab open — the alarm only rings while the tab stays open.

The alarm goes off in: ::
 
 

8:21 pm across the country

London8:21 pm
Birmingham8:21 pm
Manchester8:21 pm
Glasgow8:21 pm
Belfast8:21 pm

Times are worked out live in your browser, so daylight saving is already accounted for.

How to use the online alarm clock

Pull yourself away from the job in hand at 8:21 pm so you can unlock the hall for the choir rehearsal. The alarm marks the moment to stop, collect the keys and head out, instead of noticing the time when singers are already gathering outside. There are 39 minutes until 9:00 pm, enough for the opening arrangements once everyone is inside.

Because access to the rehearsal depends on you hearing the alert, keep this page running after setting the alarm and leave the browser available. If you close this page or the browser, the alarm cannot sound, which could leave the choir waiting outside the locked hall. Keep the sound audible, check the volume beforehand and avoid relying on a muted phone. A separate backup alarm is sensible when other people cannot enter without your key.

Leaving an air-conditioned room for an evening journey can make the outdoor warmth feel surprisingly noticeable, even in Britain after a hot day. Put the hall keys somewhere visible before 8:21 pm and keep a light layer handy for the cooler rehearsal room, where the air conditioning may still be running. A drink ready by the door also avoids searching the kitchen after the alarm sounds and losing the time reserved for opening up.

Common questions

Do I need an account or an app?

Neither. Choose a time and a sound, press Start, and it runs in this browser tab. Nothing is downloaded, nothing is registered, and closing the page leaves nothing behind on the device.

Can I change the sound?

Yes, there is a short list of tones to pick from before you press Start. Softer sounds are easy to sleep through, so a firmer bell tends to be the safer choice for anything early in the morning.

Will it still be right when the clocks change?

Yes. It reads your device's local clock, so the move between GMT and BST at the end of March and October is picked up automatically, as long as the computer's date, time and time zone are set correctly.

Can I use this on a phone?

It works in a mobile browser, but phones lock the screen and suspend background tabs far more readily than a laptop does, which can stop the alarm sounding. For anything important, a desktop or a plugged-in laptop is the steadier option.